Father and son have done it again in the 2006 publishing of "Treasure of the Khan."  You can own it and their autographs to add this, the 19th installment, to your "Dirk Pitt" collection.  Publisher's Weekly describes the plot as:   "as credible as it is monstrous and the kind of exotic aquatic detail that amazes, informs and entertains. The action, and there's plenty of it, ranges from Siberia's Lake Baikal and the wilds of Mongolia to the Hawaiian islands. The treasure is that of Genghis and Kublai Khan, the great Mongolian conqueror and his grandson."